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91.
高固体污泥微波热水解特性变化 总被引:3,自引:0,他引:3
考察浓度7%、9%和13%的高固体污泥微波热水解特性,通过生化产甲烷潜能(BMP)实验,分析热处理污泥厌氧消化性能的变化.结果表明,微波加热升温速度快,污泥中悬浮性挥发固体(VSS)和悬浮固体(SS)溶解,液相COD、TOC、氨氮、TN和TP浓度增大, pH值降低.水解效率受污泥浓度影响显著,浓度13%的污泥VSS和SS溶解率低于7%和9%的污泥.170℃热水解5min,9%污泥的VSS和SS溶解率分别为23%和18%, SCOD浓度为41g/L, TOC和氨氮浓度达到30g/L和1g/L.热水解污泥厌氧消化性能提高,9%污泥的产气量在170℃、5min和10min比未处理污泥增加27%和30.8%.热水解时间对提高消化性能影响不大,热水解由5 min到10min,120℃、150℃和170℃的产气量分别增加4%、3.6%和5.7%. 相似文献
92.
Mounaouer Brahmi Noureddine Hamed Belhadi Helmi Hamdi Abdennaceur Hassen 《环境科学学报(英文版)》2010,22(8):1218-1224
This work aimed to study UV-resistant strains of Pseudomonas aeruginosa, to propose a formulation of the kinetics of secondary
treated wastewater disinfection and to underline the influence of suspended solids on the inactivation kinetics of these strains. Some
investigations were carried out for the validation of some simulation models, from the simplest, the kinetics model of Chick-Watson
reduced to first order, to rather complex models such as multi-kinetic and Collins-Selleck models. Results revealed that the involved
processes of UV irradiation were too complex to be approached by a simplified formulation, even in the case of specific strains of
microorganisms and the use of nearly constant UV radiation intensity. In fact, the application of Chick-Watson model in its original
form is not representative of the kinetics of UV disinfection. Modification, taking into account the speed change during the disinfection
process, has not significantly improved results. On the other hand, the application of Collins-Selleck model demonstrates that it was
necessary to exceed a least dose of critical radiation to start the process of inactivation. To better explain the process of inactivation,
we have assumed that the action of disinfectant on the survival of lonely microorganisms is faster than its action on suspended solids
protected or agglomerated to each others. We can assume in this case the existence of two inactivation kinetics during the processes
(parallel and independent) of the first-order. For this reason, the application of a new kinetic model by introducing a third factor
reflecting the influence of suspended solids in water on disinfection kinetics appeared to be determinant for modeling UV inactivation
of P. aeruginosa in secondary treated wastewater. 相似文献
93.
94.
Parameters effect on heterogeneous photocatalysed degradation of phenol in aqueous dispersion of TiO_2 总被引:2,自引:0,他引:2
KASHIF Naeem 《环境科学学报(英文版)》2009,21(4)
In this study, photocatalytic degradation of phenol selected as model compound of organic pollutant had been investigated in aqueous titanium dioxide (TiO2) dispersion under UV irradiation. The effects of various parameters such as pH, catalyst concentration, phenol concentration, anions, metal ions, electron acceptors, and surfactants on the photocatalytic degradation of phenol were investigated. The degradation kinetics was determined by the change in phenol concentration employing UV-Vis spectrometry as a function of irradiation time. The degradation kinetics of phenol follows pseudo first-order kinetics. The results showed a significant dependence of the photocatalytic degradation of phenol on the functional parameters. The probable promising roles of the additives on the degradation process were discussed. 相似文献
95.
将马尾松KP法制浆过程中产生的废液的浓缩液与甲醛羟甲基化反应的产物,用三聚氰胺树脂进行接枝,制备出一种用于纸浆内添加的新型纸张增强剂.研究了羟甲基化和接枝反应的条件对纸张增强剂的性能及其对纸张物理性能的影响,并优化出反应条件.同时应用红外光谱、扫描电镜考察了纸张增强剂合成机理,证实了改性制浆废液中已经引入了羟甲基,羟甲基化制浆废液与三聚氰胺树脂之间已发生了缩合反应.结果表明,最佳羟甲基化反应条件为:制浆废液质量分数为50%,制浆废液与甲醛的质量比1∶0.2,温度70℃,时间2.5 h,pH值为11.最佳接枝工艺条件为:改性制浆废液质量分数为40%,三聚氰胺用量为改性制浆废液质量的20%,引发剂用量为三聚氰胺质量的5%,接枝反应温度70℃,接枝聚合的pH值为11.在以上条件下,增强剂用量为绝干纸浆的5%时,可使干纸断裂长提高28%,湿纸断裂长达干纸的24%.同时,制浆废液纸张增强剂颜色较深,更适用于对白度要求不高的本色浆产品. 相似文献
96.
Beijing Tong Ren Tang Company Limited Scientific Research Institute, Beijing 100011, China 总被引:1,自引:0,他引:1
WU Lin-lin WU Guang-xi XU Shu-guang ZHONG Hui SHEN Ying-jie LIU He-zhi HUANG Zheng-ming YANG Xin-bo YUAN Zong-huan TANG Lian-yi LIN Xiang-wei ZHANG Shao-lai ZHANG Wei-jun 《环境科学学报(英文版)》2007,19(11):1387-1392
By dynamic method under UV irradiation,commercial melt-blown polypropylene(PPMB)filter element was modified with acrylamide(AAm)using benzophenone(BP)as initiator.Attenuated total reflection-Fourier transform infrared spectroscopy and scanning electron microscope verified that polyacrylamide chain was grafted on the fiber surface of PPMB filter element.Elemental content analysis with energy dispersive X-ray of fibers revealed that the polymerization content in the inner part of filter element was relatively higher than that in the outer.Degree of grafting changed with initiator concentration,monomer concentration,reaction temperature and reached 2.6% at the reaction condition:C_(BP)=0.06 mol/L,C_(AAm)=2.0 mol/L,irradiation time:80 min,temperature: 60℃.Relative water flux altered with the hydrophilicity and pore size of filter element.In the antifouling test,the modified filter gave greater flux recovery(approximately 70%)after filtration of the water extract of Liuweidihuang,suggesting that the fouling layer was more easily reversible due to the hydrophilic nature of the modified filter. 相似文献
97.
Degradation of bisphenol-A using ultrasonic irradiation assisted by
low-concentration hydrogen peroxide 总被引:1,自引:0,他引:1
Kejia Zhang Naiyun Gao Yang Deng Tsair Fuh Lin Yan M Lei Li Minghao Sui 《环境科学学报(英文版)》2011,23(1):31-36
This study investigated the degradation of bisphenol-A (BPA) by ultrasonic irradiation in the presence of different additives (H2O2,air bubbles and humic acid) under various operating conditions,i.e.,ultrasonic frequency,power intensity and power density.The results demonstrated that the BPA degradation followed pseudo first-order kinetics under different experimental conditions.The optimum power intensities were 0.9,1.8,and 3.0W/cm 2 at the frequencies of 400,670,and 800 kHz,respectively.At the fixed frequ... 相似文献
98.
99.
A novel cellulose-based adsorbent, iron(III)-coordinated amino-functionalised poly(glycidylmethacrylate)-grafted cellulose [Fe(III)–AM-PGMACell] was developed for the removal of phosphate from water and wastewater. The scanning electron micrograph showed that AM-PGMACell has a rougher surface than cellulose and the adsorption of Fe(III) on AM-PGMACell made the surface even rougher. Infrared spectroscopy revealed that amino groups on the surface of AM-PGMACell complexed with Fe(III) played an important role in the removal of phosphate from solutions. X-Ray diffraction patterns showed a decrease in crystallinity after graft copolymerisation onto cellulose. The effects of contact time, initial sorbate concentration, pH, agitation speed, dose of adsorbent and temperature on the removal process were investigated. Maximum removal of 99.1% was observed for an initial concentration of 25 mg·L ?1 at pH 6.0 and an adsorbent dose of 2.0 g·L ?1. A two-step pseudo-first-order kinetic model and Sips isotherm model represented the measured data very well. Complete removal of 11.6 mg·L ?1 phosphate from fertiliser industry wastewater was achieved by 1.6 g·L ?1 Fe(III)–AM-PGMACell. The adsorbent exhibited very high reusability for several cycles. Overall, the study demonstrated that Fe(III)–AM-PGMACell can be used as an efficient adsorbent for the removal and recovery of phosphate from water and wastewater. 相似文献
100.
G. S. Muthu Iswarya B. Nirkayani A. Kavithakani V. C. Padmanaban 《Frontiers of Environmental Science & Engineering》2019,13(3):42